Measurement and Instrumentation
Consider the following statement - 1. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the current coil. 2. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the voltage coil circuit.

 Both 1 and 2 are true.
 1 is true but 2 is false.
 Both 1 and 2 are false.
  1 is false but 2 is true.

ANSWER DOWNLOAD EXAMIANS APP

Measurement and Instrumentation
A Manganin swap resistance is connected in series with a moving coil ammeter consisting of a milli ammeter and a suitable shunt in order to

 Obtaine large deflecting torque.
 Minimize the effect of stray magnetic fields.
 Reduce the size of the meter.
  Minimize the effect of temperature variation.

ANSWER DOWNLOAD EXAMIANS APP

Measurement and Instrumentation
In DC potentiometer measurments, a second reading is often taken after reversing the polarities of the DC supply and the unknown voltage and the average of the two reading is taken. This is with a view of eliminate the effects of

 Stray magnetic fields.
 Ripples of the DC supply.
  Stray thermal emfs.
 Errorneous standardisation.

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Measurement and Instrumentation